export default {
  // 为当前模块开启命名空间
    namespaced: true,
  
    // 模块的 state 数据
    state: () => ({
      // 购物车的数组，用来存储购物车中每个商品的信息对象
      // 每个商品的信息对象，都包含如下 6 个属性：
      // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
      cart: JSON.parse(uni.getStorageSync('cart') || '[]')
    }),
  
    // 模块的 mutations 方法
    mutations: {
     addToCart(state,goods){
       const findResult= state.cart.find(x => x.goods_id === goods.goods_id)
       
       if(!findResult){
         state.cart.push(goods)
       }else{
         findResult.goods_count++
       }
       
       this.commit('m_cart/saveToStorage')
     },
     saveToStorage(state){
       uni.setStorageSync('cart',JSON.stringify(state.cart))
     },
// 更新购物车中商品的勾选状态
updateGoodsState(state, goods) {
  // 根据 goods_id 查询购物车中对应商品的信息对象
  const findResult = state.cart.find(x => x.goods_id === goods.goods_id)

  // 有对应的商品信息对象
  if (findResult) {
    // 更新对应商品的勾选状态
    findResult.goods_state = goods.goods_state
    // 持久化存储到本地
    this.commit('m_cart/saveToStorage')
  }
},
updateGoodsCount(state, goods) {
const findResult = state.cart.find(x=> x.goods_id === goods.goods_id)
  if (findResult) {
    // 更新对应商品的勾选状态
    findResult.goods_count = goods.goods_count
    // 持久化存储到本地
    this.commit('m_cart/saveToStorage')
  }
},
removeGoodsById(state , goods_id){
  state.cart = state.cart.filter(x => x.goods_id != goods_id)
  this.commit('m_cart/saveToStorage')
},
// 更新购物车中所有商品的勾选状态
updateAllGoodsState(state, newState){
  state.cart.forEach(x => x.goods_state = newState)
  this.commit('m_cart/saveToStorage')
}
    },
  
    // 模块的 getters 属性
    getters: {
      
      total(state) {
        // let c=0
        // state.cart.forEach(x => c += x.goods_count)
        // return c
        return state.cart.reduce((total, item)=>total+=item.goods_count ,0)
      },
      
      checkedCount(state) {
        return state.cart.filter(x => x.goods_state).reduce((total, item)=> total += item.goods_count,0)
      },
      checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item)=> total += item.goods_count * item.goods_price ,0).toFixed(2)
      }
    },
}
